We All Know About Royal Weddings — Here's What You Don't Know About Royal Anniversaries

The Queen's youngest son, Prince Edward, and his wife Sophie Rhys-Jones were married on the same date (June 19) as two other royal pairings — Sweden's Crown Princess Victoria and Prince Daniel, as well as Victoria's parents, King Carl XVI Gustaf and Queen Silvia of Sweden.

For their first wedding anniversary, Kate Middleton cooked Prince William fish en papillote — fish wrapped in parchment paper — in honour of the traditional first anniversary paper gift.

Kate and William's fourth wedding anniversary was a quiet affair, given that Kate was already six days overdue with Charlotte, who still wouldn't arrive for three more days.

The Queen gave birth to Prince Charles on Nov. 14, just six days before her and Philip's first wedding anniversary, while Philip was elsewhere in the residence playing squash with his secretary. Bonus fact: Nov. 14 was also the date of Princess Anne and Captain Mark Phillips' wedding in 1973, though the two divorced in 1992.

May 19, Prince Harry and Meghan Markle's wedding date, happens to be the same day that King Henry VIII had his wife Anne Boleyn executed in 1536.

Queen Elizabeth and Philip's silver (25th), gold (50th), and diamond (60th) anniversaries were all marked with celebrations at Westminster Abbey, though the Queen elected to have a small gathering for their platinum (70th) anniversary last year.

To mark the Queen and Philip's 70th anniversary, the Abbey's bells rang a full peal consisting of 5,070 sequences that took three and a half hours to complete.

The Queen became the first monarch in British history to celebrate a platinum wedding anniversary.

To celebrate their platinum anniversary, the Queen appointed Philip the Knight Grand Cross of the Royal Victorian Order.

In 1952, Philip recruited Boucheron to create a gold, diamond, sapphire, and ruby bracelet he'd designed himself, featuring links of interlocking Es and Ps, that he gave to the Queen for their fifth wedding anniversary.